Enallagma cyathigerum; thorax, maleNote: Such wide antehumeral stripes also occur in Erythromma lindenii but males of that species have a black line on the metapleural suture.

Enallagma cyathigerum (left) and Erythromma lindenii (right); S8-S10 and appendages, maleIn Enallagma cyathigerum S8 and S9 are blue, S10 is black and the appendages are shortIn Erythromma lindenii S8 is black, S9 and S10 are blue and the appendages are long

Enallagma cyathigerum; abdomen, femaleNote: Female Ischnuras also have a vulvar spine, but it is absent in Coenagrion and Erythromma species.

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